CVE-2026-33523: Apache HTTP Server: multiple modules: HTTP response splitting forwarding malicious status line

Overview

Severity

Medium (CVSS 6.5)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Exploit Status

Not Exploited

Patch Tuesday

2026-May

Released

2026-05-07

EPSS Score

0.16% (percentile: 36.8%)

Affected Products (2)

Other

• 21321-17086
• 21220-17084

Revision History

• 2026-05-07: Information published.